Question

Methane on complete combustion gives a _______ flame.

• A. blue
• B. yellow
• C. red
• D. green

Answer 1

The correct option is A blue

Methane gas $\left(C{H}_4\right)$ is highly inflammable. It burns by reacting with oxygen to give a clean blue flame. During this reaction carbon dioxide $\left(C{O}_2\right)$ and oxygen $\left(O_2\right)$ gases are released.

$C{H}_4\left(g\right)+2O_2\left(g\right)\to C{O}_2\left(g\right)+2H_{2}O\left(g\right)+heat$